Question

Why variegated plants is taken for the experiment to show importance of chlorophyll?

Answer 1

First variegated leaf is taken to the to a place having optimum sunlight .
Then the plant is allowed to perform photosynthesis..
the green plants are able to perform photosynthesis only on those region where chlorophyll is present
In variegated leaf only those regions having green colour show positive test for photosynthesis and the leaf parts having other colours do not show any positive test

hence variegated plants has both green and other colored patches so by performing the photosynthesis experiment on it we can clearly prove that chlorophyll regions only perform photosynthesis hence chlorophyll is necessary for photosynthesis
there's a pic attached to the answer for better understanding hope it helps..☺